U+2119 "ℙ" Double-Struck Capital P Unicode Character

U+2119 "ℙ" Double-Struck Capital P is a mathematical symbol typically used to denote the set of prime numbers or, in some contexts, the projective plane or probability measures. It belongs to the group of double-struck (also called blackboard bold) letters, which are commonly employed in mathematics to represent specific number sets, such as ℕ for natural numbers, ℤ for integers, and ℙ for primes. This character can be found in the Letterlike Symbols block of Unicode and is distinct from the ordinary Latin capital P, serving a specialized function in academic and technical writing to avoid ambiguity.